Scarifier attachment for road-graders



J. A. WILLIAMS. SCARIFIER ATTACHMENT FOR ROAD GRADERS. APPLICATION FILED JAN. 14. I920.

1,352,714, Patented Sept. 14,1920.

Guam e14 JOHN-ABSALOM w'ILLIAMs, or a noea, anest SCARIFIER ATTACHMENT m. oan-Gimmes.

Specification of Letters Intent.

Application filed J'anu'ary'l l, 1920. Serial No. 351,339.

To all whom it may concern:

Be 1t known that 1, JOHN A. WILLIAMs, a citizen of'the Umted States, and a resident of Aurora,in the county of-Lawre'nce' and State of Missouri, have invented certain new and useful Improvements in Soarifier Attachments for Road-Graders, of which the following is a specification.

My invention relates to road graders and more particularly to a soarifier attachment therefor. e A purpose of my invention 1s the provision of a scarifier of simple and etficlent construction having teeth of a form to per-' mit additional metal being welded thereon when they become worn or broken, thereby eliminating any waste of the metal.

' It is also a purpose of my invention to provide a scarifier including a slotted block having projections co-acting with clamping members for effectively securing the teeth in adjusted position within the-block, the block being provided with means for attaching it to any standard form of road grader so that the scarifier as a'unit is capable of vertical adjustment.

I will describe one form of scarifier embodying my invention and will. then point out the novel features thereof in claims.

In the accompanying drawings,

Figure 1 is a View showing in phantom one form of road grader having applied thereto one form of. scarifier embodying my invention.

Fig. 2 is a longitudinal sectional view of the scarifier shown in Fig. 1, with certain of the teeth and clamping members removed therefrom.

Fig. 3 is a view showing in rear elevation,

the scarifier shown in Fig. 2.

Fig. 4 is a view showing an end elevat1on, of the scarifier shown in the preceding views.

Fig. 5 is a detail perspective view of one of the clamping members shown in the preceding views.

Fig. 6 is a detailed perspective view of one of the teeth used in the scarifier.

Similar reference characters refer to similar parts in each of the several views.

Referring specifically to the drawings, the scarifier is here shown as comprising a block 13 which is slotted longitudinally at its rear side to provide a channel 15 for receiving clamping members designated generally at C. Ag shown in Fig. 2, the

1 with the clamping member atented Sept.14, 1920.

block B is provided with rectangular open- '2 ings 16 which are disposed on a i li Wltll' relationto the vertical and are prefer-J metal of rectangular'contour in cross sectionwith one end thereof pointed by bev'elmg two of itsfaces so that the point terminates at one corner of the tooth. The tooth T is'provided withnotches 18 for coi-a'ction the teeth within the" block.

As shown in Figs. 2'and 3, the rear side :6 in securing of the block B shaped to provide at intervals companion projections 19' and 19 faces for the actuating meansj for'theclampwhich are disposedupon opposite sidesof f the channel 15." These projections are provided with oblique surfaces and are de-' signed to formabutments or'bearing sur ing members C and to bring each clamping member in line Withthe position of. the par -'ticular tooth it is tohold. As illustrated to advantage in Fig. 5, each clampingmenr ber shown in Fig. 2, one of the teeth T extends through the ring 21 and is adapted to be locked against movement within the corresponding opening 16 by a'rearward move-' ment of the ring so as to cause the latter to firmly engage the teeth within one of the notches 18. This is efiected through the medium of the nut 22 which bears against the corresponding pair of projections 19 C comprises ashank portion2O bent at j one of its ends to provide a ring 21, its 'opposite end being screw threaded to accomand 19 so that when it is rotated in the proper direction upon the shank 20, the.

rearward feeding of the shank is effected which in consequence causes a rearward movement of the ring 21. WVith the rearward movement of the ring, it engages the tooth in any one of the notches 18 depen'd-. ing upon the adjustment of the tooth, it being understood that the tooth is manually adjusted within the block prior to the move ment of the'ring to clamping position. A plate 23 is slidably fitted upon the shank 20 of the clamping member C and is interposed between the projections 19 and 19" and the nut 22. This plate 23 serves as a Washer for the nut and at the same time properly positions the shank Within the channel 15. As shown in Fig. 1, the scarifier is provided With six vertical teeth Which are arranged in sets of three, With the teeth of one set disposed in divergent relationto the teeth of the other set, and all of the teeth inclined With relation to the vertical. With the teeth arranged in this manner, it Will beclear that the projections .19 and 19 serve tolmaintain the clamping members in angular position With relationto the teeth KT so that the ,ring of anyone clamping member will properly engage the shank of the corresponding tooth to I firmly hold the latter in position. I Theprojections l9 and 1.9also provide faces to receive the plates 28 normalto thestress of thekclamping members C.

As illustrated to advantage inFigsQ and 4:,the. opposite ends of the block B are recessed longitudinally for a short distance; to

provide sockets 24 for-removably receiving certain of the teeth Tand for supporting the same in a horizontal position. The teeth T are locked in adjusted position Within the sockets 24:. by pins 25 .Which intersectqthe soekets at rightangles so that-a portion of the pinswhenin the applied position will be disposed Within one of the notches ,18 ofthe teethtoeffect a secure locking of theteeth Within the block.

Although I have :herein-shovvn and ,de scribed only one .form of scarifier embodying my invention, it is; tobe' understood, that various changes ,andmodifications may-be made herein Without departing from the spirit of the'invention and the spirit-and scope of the appended claims.

Having shown and described my invention, What I claim is:

1. In a scarifier, a block having a channel formed therein and openings in the Walls of said channel inclined to the edges of the block, teeth slidable through said openings contour in crosssectionslidably fitted with in said openings in a manner to bridge Stud channel, oblique projections formed on the .edgesof the Walls or said channel, and

clamping means Working Within said 'chan vnel .andchavin members enga in the rol: a r1 2'? jections Which provid faces normal to the line of stresso'f said means,'each of said members comprising,.a ring adapted V te embrace a tooth at a point between the chan- V ;nel,ashankiformed integral with said ring and having ,a threaded portion extending eXteriorl-y of the channel, a nut on the threaded portion of said shank, and a plate ;m0vable:onvthe shank, said plate spanning certai-nhofthe projections and adapted to be engaged by said nut forv causingthe same to move said shankand ring in the direction of the pro ections. V

JOHNABSALOMWILLIAMS. 

